Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 151)

151

AT8xC5132

4173A–8051–08/02

Analog to Digital Converter

Definition of Symbols Table 141. Analog to Digital Converter Timing Symbol Definitions

Characteristics Table 142. Analog to Digital Converter AC Characteristics

= 2.7 to 3.3V, T

= 0 to 70°C

Notes: 1. AV

= AV

REFP

= 3.0V, AV

= AV

REFN

= 0V. ADC is monotonic with no missing code.

2. The differential non-linearity is the difference between the actual step width and the

ideal step width (see Figure 130).

3. The integral non-linearity is the peak difference between the center of the actual step

and the ideal transfer curve after appropriate adjustment of gain and offset errors

(see Figure 130).

4. The offset error is the absolute difference between the straight line which fits the

actual transfer curve (after removing of gain error), and the straight line which fits the

ideal transfer curve (see Figure 130).

5. The gain error is the relative difference in percent between the straight line which fits

the actual transfer curve (after removing of offset error), and the straight line which

fits the ideal transfer curve (see Figure 130).

Waveforms

Figure 129. Analog-to-Digital Converter Internal Waveforms

Signals Conditions

C Clock H High

E Enable (ADEN bit) L Low

Start Conversion

(ADSST bit)

Symbol Parameter Min Max Unit

CLCL

Clock Period 1.43 µs

EHSH

Start-up Time 4 µs

SHSL

Conversion Time 11·T

CLCL

µs

DLe

Differential non-

linearity error

(1), (2)

TBD LSB

ILe

Integral non-

linearity error

(1),( 3)

TBD LSB

OSe Offset error

(1),(4)

TBD LSB

Ge Gain error

(1),( 5)

TBD %

ADEN Bit

ADSST Bit

EHSH

SHSL

CLK

CLCL

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 161 162

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